Question:
Which of the following is not combustible?
Which of the following is not combustible?
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Hydrogen, carbon monoxide, and methane are combustible gases, while carbon tetrachloride is non-combustible.
Updated On: May 27, 2026
- Hydrogen
- \(CO\)
- \(CCl_4\)
- \(CH_4\)
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The Correct Option is C
Solution and Explanation
A combustible substance is one which can burn in air or oxygen.
Hydrogen is highly combustible:
\[
2H_2+O_2\rightarrow 2H_2O.
\]
Carbon monoxide is also combustible:
\[
2CO+O_2\rightarrow 2CO_2.
\]
Methane is a common fuel gas:
\[
CH_4+2O_2\rightarrow CO_2+2H_2O.
\]
Carbon tetrachloride:
\[
CCl_4
\]
does not burn easily.
It is non-combustible and has been used historically as a fire extinguishing liquid.
Therefore, the substance which is not combustible is:
\[
CCl_4.
\]
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